And it looked like he made the most of his belated birthday party (he actually turned 28 August 3rd).

After posing on the carpet in patriotic swim trunks and one of his gold medals from the London Games, the 90210 guest star stripped down to a pink speedo and kicked off the party, popping champagne and mingling with ladies in the pool.

As a tribute to his medal wins in London, servers in gold bikinis brought out a birthday cake for Lochte. Lending a whole new meaning to the phrase, going for the gold.

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